单项选择题

What is the writer’s main point

A．Animals yawn for a number of reasons.
B．Yawning results only from fatigue or boredom.
C．Human yawns are the same as those of other animals.
D．Only social animals yawn.

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单项选择题

Which of the following statements is NOT true according to the information in the passage

A．Some monkeys use their hands to grasp objects.
B．A spider monkey has a very long tail.
C．A prehensile tail has fingers.
D．Asiatic gibbons can swing through trees.

单项选择题

In what year was Baltimore established

A．1729.
B．1750.
C．1776.
D．1788.